Placing an image under a transparent object won't reflect in it
If you are using Eevee as your render engine, in Render Properties you have to enable Screen Space Reflections
Without
With
If you are using cycles it should work unless your dominos have bad geometry.
Select a domino
take it into edit mode
select all
type SHIFT-N to recalculate normals.
If that doesn't work you've got other geometry problems.